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Check BSSIDs

When you receive a capture whose principal traffic is Wifi using WireShark you can start investigating all the SSIDs of the capture with Wireless --> WLAN Traffic:

Brute Force

One of the columns of that screen indicates if any authentication was found inside the pcap. If that is the case you can try to Brute force it using aircrack-ng:

aircrack-ng -w pwds-file.txt -b <BSSID> file.pcap

Data in Beacons / Side Channel

If you suspect that data is being leaked inside beacons of a Wifi network you can check the beacons of the network using a filter like the following one: wlan contains <NAMEofNETWORK>, or wlan.ssid == "NAMEofNETWORK" search inside the filtered packets for suspicious strings.

Find unknown MAC addresses in a Wiffi network

The following link will be useful to find the machines sending data inside a Wifi Network:

((wlan.ta == e8:de:27:16:70:c9) && !(wlan.fc == 0x8000)) && !(wlan.fc.type_subtype == 0x0005) && !(wlan.fc.type_subtype ==0x0004) && !(wlan.addr==ff:ff:ff:ff:ff:ff) && wlan.fc.type==2

If you already know MAC addresses you can remove them from the output adding checks like this one: && !(wlan.addr==5c:51:88:31:a0:3b)

Once you have detected unknown MAC addresses communicating inside the network you can use filters like the following one: wlan.addr==<MAC address> && (ftp || http || ssh || telnet) to filter its traffic. Note that ftp/http/ssh/telnet filters are useful if you have decrypted the traffic.

Decrypt Traffic

Edit --> Preferences --> Protocols --> IEEE 802.11--> Edit